What is word? I Every word has a fixed sound form and a certain meaning. In other words, a word has two aspects: the external aspect(sound), the internal aspect (meaning). I A word is a unity of sound and meaning I a word is a fundamental structure unit of a sentence I The relation between the meaning of a word and its sound is arbitrary or conventionalWhat is Word? Every word has a fixed sound form and a certain meaning. In other words, a word has two aspects: the external aspect (sound), the internal aspect (meaning). A word is a unity of sound and meaning. A word is a fundamental structure unit of a sentence. The relation between the meaning of a word and its sound is arbitrary or conventional